Back Page, June 2021

June 2, 2021

20 Years Ago

Specialty locks were the subject of our June 2001 issue. W-Lok featured a new LoopLok that has a combined lock and cable system. The ABLOY lockable-knob mortise cylinder was the subject of an article by Gale Johnson. Gale also wrote a technical article about Timberline locks. Olympus introduced a combination cabinet lock and door-pull unit. Several new products from Master Lock were shown, including a steering wheel lock, 2050 combination lock and the 185/187 series padlock that has a shielded shackle. Jerry Levine helped to install an electrified Marray exit device on an aluminum door. Gale Johnson reported on a new Toyota lock system that used the TR47 key blank. Cut spacing is always a problem. Dick Zunkel explained what “balanced” doors are. Wedgco showed its new key extractor kit. John Grist introduced us to several neat tools used for electronic lock installations. Tiny took apart the locks on a 2000 Mitsubishi Montero. Lori Jo Smith was featured as a woman in locksmithing. Dave Franchuk provided hints on the safe KISS system, which stands for Know the Inside Structure of the Safe.        

10 Years Ago

Probably one of the most confusing areas of locksmithing is servicing large trucks and semis, according to an informative Jerry Levine article and key-blank chart. Steve Kaufman profiled locksmith Jim Sundstrond, an early proponent of transitioning into electronics. Wireless electronic access control systems were promoted as easier to install and retrofit than fully wired systems. A sales and marketing article by Woody Quinones urged locksmiths to actively solicit customers. Gale Johnson described new uses for the A-1 Manufacturing Pak-A-Punch key machine. Logic America’s Wenxing Sidewinder Duplicator made keys for an increasing number of sidewinder automobile locks. Tim O’Leary reported on installing wireless home alarm systems as a new profit center. Bill Spence, Lumidigm, explained multispectral imaging technology for biometric fingerprint readers. This technology relied on touching the reader, which largely has been replaced by touch-free biometric alternatives, post-COVID.

Installing the SDC Quiet Duo Electric Latch Retraction for Exit Devices

Read the full article at

In this article, an SDC LR100VDK Electric Latch Retraction Kit was installed on a Von Duprin 98 exit device. The door is an employee entrance that leads into a warehouse. The door is equipped with a Von Duprin 98 rim exit device that has mechanical dogging and lever trim.

The Von Duprin 98 rim exit device’s mechanical dogging mechanism rotates to capture the latch-retraction rod when the pushpad is depressed, placing the exit device in the dogged or passage mode. The Quiet Duo Kit replaces the mechanical dogging assembly.

To install the Quiet Duo Kit, the two rivets securing the mechanical dogging assembly must be drilled out and the dogging assembly removed for those exit devices shipped after August 1997. Two screws secure the dogging assembly on previous models.

To begin the removal of the dogging assembly, remove the end cap, the cover plate and mounting bracket to gain access to the mechanical dogging assembly. Remove the dogging shaft and the dogging hook to expose both of the rivets that secure the assembly. After the rivets are drilled out, remove the dogging assembly from the case. Use a brush to remove any metal debris.

Slide the LR100VDK onto the case. Connect the supplied LR100 linkage onto the device’s latch-retraction rod and the latch-retraction clevis. Be sure to remove any slack in the linkage before tightening the two setscrews by using a 5/64 hex wrench.

At this time, make the electrical connections to test the operation before reassembling. Use wire connectors (beans) to ensure a good connection. Finish assembling the exit device components. Test the manual operation of the exit device.

Test the electrical operation. The stepper motor should retract the pushpad and the Pullman latch. When power is removed, the pushpad and latch will extend.

After the stepper motor completes its operation of retracting the pushpad and Pullman latch, an electromagnet keeps the latch and pushpad retracted. After the exit device is in the passage mode, it will remain in that mode until power is withdrawn.

SDC Electric Latch Retraction Kits are compatible with:

  • Adams Rite 8800 & 8100 Series
  • Corbin ED5200 & ED5800 Series
  • Dor-O-Matic 1590 & 1490 Series
  • Hager 4500 Series
  • K2 QED300 Series
  • SDC Spectra S6000 Series
  • Von Duprin 98/99, XP98/XP99, 33/35 and 22 Series
  • Yale 7100 & 7110
  • Precision Hardware Apex 2000 Series

Components required for this installation include:

  • SDC Quiet Duo, Part LR100VDK
  • SDC One Amp Power Supply, Part 602RF
  • SDC Power Transfer Hinge four-wire, Part PTH-4
  • SDC Seven Day, Skip-A-Day Timer 24VAC/DC, Part 14-2
  • Two SDC 12-Volt 4-Amp Rechargeable Batteries, Part RB12V4
  • 18 Gauge 2 lead stranded wire